<template>
  <!--推荐页面-->
  <div class="recommend" ref="recommend">
    <scroll ref="scroll" class="recommend-content" :data="discList">  <!--要滚动的部分就是歌单数据的部分，所以传了discList-->
      <div>
        <div v-if="recommends.length" class="slider-wrapper" ref="sliderWrapper"> <!--判断是为了slider里面的mounted的执行-->
          <!--图片轮播组件-->
          <slider>
            <div v-for="item in recommends">
              <a :href="item.linkUrl"> <!--点击轮播图片时跳转链接(所以此时是链接的地址)-->
                <img class="needsclick" @load="loadImage" :src="item.picUrl">
              </a>
            </div>
          </slider>
        </div>
        <div class="recommend-list">
          <h1 class="list-title">热门歌单推荐</h1>
          <ul>
            <!--点击进入歌单的详情页面-->
            <li @click="selectItem(item)" v-for="item in discList" class="item">
              <div class="icon">
                <!--懒加载图片部分-->
                <img width="60" height="60" v-lazy="item.imgurl">
              </div>
              <div class="text">
                <h2 class="name" v-html="item.creator.name"></h2> <!--如果返回数据里面带有一些字符，那么久使用v-html就行转义-->
                <p class="desc" v-html="item.dissname"></p>
              </div>
            </li>
          </ul>
        </div>
      </div>
      <div class="loading-container" v-show="!discList.length">  <!--当歌单数据没有的时候-->
        <loading></loading>
      </div>
    </scroll>
    <!--二级路由的展示容器(歌单)-->
    <router-view></router-view>
  </div>
</template>

<script type="text/ecmascript-6">
  import Slider from 'base/slider/slider' // 图片轮播组件
  import Loading from 'base/loading/loading'
  import Scroll from 'base/scroll/scroll'
  import { getRecommend, getDiscList } from 'api/recommend' // 引用数据
  import { playlistMixin } from 'common/js/mixin'
  import { ERR_OK } from 'api/config' // 判断返回是否成功
  import { mapMutations } from 'vuex'

  export default {
    mixins: [playlistMixin],
    data () {
      return {
        recommends: [], // 图片轮播的数据
        discList: [] // 推荐歌单数据列表数据
      }
    },
    created () {
      this._getRecommend() // 图片轮播的数据
      this._getDiscList()  // 歌单列表的数据
    },
    methods: {
      handlePlaylist (playlist) {
        const bottom = playlist.length > 0 ? '60px' : ''
        this.$refs.recommend.style.bottom = bottom
        this.$refs.scroll.refresh() // 因为是scroll组件所以在适配的时候要调用refresh
      },
      loadImage () { // 调用scroll的refresh方法
        if (!this.checkloaded) {
          this.checkloaded = true
          this.$refs.scroll.refresh()
        }
      },
      // 点击进入歌单详情页面
      selectItem (item) {
        this.$router.push({ // 传过去背景图和标题名
          path: `/recommend/${item.dissid}`
        })
        this.setDisc(item)
      },
      // 获取图片轮播的数据
      _getRecommend () {
        getRecommend().then((res) => {
          if (res.code === ERR_OK) {
            this.recommends = res.data.slider
          }
        })
      },
      // 获取歌单的数据
      _getDiscList () {
        getDiscList().then((res) => {
          // console.log(res)
          if (res.code === ERR_OK) {
            this.discList = res.data.list
          }
        })
      },
      ...mapMutations({
        setDisc: 'SET_DISC' // 歌单
      })
    },
    components: {
      Slider,
      Loading,
      Scroll
    }
  }
</script>

<style scoped lang="stylus" rel="stylesheet/stylus">
  @import "~common/stylus/variable"

  .recommend
    position: fixed
    width: 100%
    top: 88px
    bottom: 0
    .recommend-content
      height: 100%
      overflow: hidden
      .slider-wrapper
        position: relative
        width: 100%
        overflow: hidden
      .recommend-list
        .list-title
          height: 65px
          line-height: 65px
          text-align: center
          font-size: $font-size-medium
          color: $color-theme
        .item
          display: flex
          box-sizing: border-box
          align-items: center
          padding: 0 20px 20px 20px
          .icon
            flex: 0 0 60px
            width: 60px
            padding-right: 20px
          .text
            display: flex
            flex-direction: column
            justify-content: center
            flex: 1
            line-height: 20px
            overflow: hidden
            font-size: $font-size-medium
            .name
              margin-bottom: 10px
              color: $color-text
            .desc
              color: $color-text-d
      .loading-container
        position: absolute
        width: 100%
        top: 50%
        transform: translateY(-50%)
</style>
